What new features are planned to the C# language in the next Visual Studio “14” release?

If you have tested Visual Studio's next version "14" previews, you have probably noticed that the C# language is evolving as well. This includes the release of Roslyn, or the new "non-black box compiler", as the saying goes.

The final release of the C# language will naturally be slightly different from the current state of the preview C#, but even so, I believe the current state is pretty close to what will become available later in 2015 when the next version is ready for release.

The current Roslyn discussion board contains a nice discussion about the current state of C# vNext. Check it out.